diff --git a/src/Search/FullTextSearch.php b/src/Search/FullTextSearch.php
index 142f43a..9f67393 100644
--- a/src/Search/FullTextSearch.php
+++ b/src/Search/FullTextSearch.php
@@ -30,7 +30,8 @@ class FullTextSearch
      * abstract indexes). Can optionally be filtered to only return indexes that are subclasses of some class
      *
      * @static
-     * @param String $class - Class name to filter indexes by, so that all returned indexes are subclasses of provided class
+     * @param String $class - Class name to filter indexes by, so that all returned indexes are subclasses of provided
+     * class
      * @param bool $rebuild - If true, don't use cached values
      */
     public static function get_indexes($class = null, $rebuild = false)
@@ -99,7 +100,8 @@ class FullTextSearch
     /**
      * Sometimes, like when in tests, you want to restrain the actual indexes to a subset
      *
-     * Call with one argument - an array of class names, index instances or classname => indexinstance pairs (can be mixed).
+     * Call with one argument - an array of class names, index instances or classname => indexinstance pairs (can be
+     * mixed).
      * Alternatively call with multiple arguments, each of which is a class name or index instance
      *
      * From then on, fulltext search system will only see those indexes passed in this most recent call.
diff --git a/src/Search/Processors/SearchUpdateCommitJobProcessor.php b/src/Search/Processors/SearchUpdateCommitJobProcessor.php
index 7f85a64..8bc4148 100644
--- a/src/Search/Processors/SearchUpdateCommitJobProcessor.php
+++ b/src/Search/Processors/SearchUpdateCommitJobProcessor.php
@@ -2,21 +2,20 @@
 
 namespace SilverStripe\FullTextSearch\Search\Processors;
 
+use DateTime;
+use DateInterval;
 use SilverStripe\FullTextSearch\Search\FullTextSearch;
 use SilverStripe\Core\Config\Config;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\ORM\FieldType\DBDatetime;
-use DateTime;
-use DateInterval;
 use stdClass;
-
-if (!interface_exists('Symbiote\QueuedJobs\Services\QueuedJob')) {
-    return;
-}
-
 use Symbiote\QueuedJobs\Services\QueuedJob;
 use Symbiote\QueuedJobs\Services\QueuedJobService;
 
+if (!interface_exists(QueuedJob::class)) {
+    return;
+}
+
 class SearchUpdateCommitJobProcessor implements QueuedJob
 {
     /**
diff --git a/src/Search/Processors/SearchUpdateQueuedJobProcessor.php b/src/Search/Processors/SearchUpdateQueuedJobProcessor.php
index 06596a4..2433d87 100644
--- a/src/Search/Processors/SearchUpdateQueuedJobProcessor.php
+++ b/src/Search/Processors/SearchUpdateQueuedJobProcessor.php
@@ -4,14 +4,13 @@ namespace SilverStripe\FullTextSearch\Search\Processors;
 
 use SilverStripe\Core\Config\Config;
 use stdClass;
-
-if (!interface_exists('Symbiote\QueuedJobs\Services\QueuedJob')) {
-    return;
-}
-
 use Symbiote\QueuedJobs\Services\QueuedJob;
 use Symbiote\QueuedJobs\Services\QueuedJobService;
 
+if (!interface_exists(QueuedJob::class)) {
+    return;
+}
+
 class SearchUpdateQueuedJobProcessor extends SearchUpdateBatchedProcessor implements QueuedJob
 {
     /**
diff --git a/src/Search/SearchIntrospection.php b/src/Search/SearchIntrospection.php
index 8f061d0..f222181 100644
--- a/src/Search/SearchIntrospection.php
+++ b/src/Search/SearchIntrospection.php
@@ -45,7 +45,7 @@ class SearchIntrospection
                 $classes = array_unique(array_merge($classes, array_values(ClassInfo::subclassesFor($class))));
             }
 
-            $idx = array_search('SilverStripe\ORM\DataObject', $classes);
+            $idx = array_search(DataObject::class, $classes);
             if ($idx !== false) {
                 array_splice($classes, 0, $idx+1);
             }
diff --git a/src/Search/Updaters/SearchUpdater.php b/src/Search/Updaters/SearchUpdater.php
index 2098db3..ee7f272 100644
--- a/src/Search/Updaters/SearchUpdater.php
+++ b/src/Search/Updaters/SearchUpdater.php
@@ -14,12 +14,12 @@ use SilverStripe\FullTextSearch\Search\Processors\SearchUpdateImmediateProcessor
 use ReflectionClass;
 
 /**
- * This class is responsible for capturing changes to DataObjects and triggering index updates of the resulting dirty index
- * items.
+ * This class is responsible for capturing changes to DataObjects and triggering index updates of the resulting dirty
+ * index items.
  *
- * Attached automatically by _config calling SearchUpdater#bind_manipulation_capture. Overloads the current database connector's
- * manipulate method - basically we need to capture a manipulation _after_ all the augmentManipulation code (for instance Version's)
- * is run
+ * Attached automatically by _config calling SearchUpdater#bind_manipulation_capture. Overloads the current database
+ * connector's manipulate method - basically we need to capture a manipulation _after_ all the augmentManipulation code
+ * (for instance Version's) is run
  *
  * Pretty closely tied to the field structure of SearchIndex.
  *
diff --git a/src/Solr/Reindex/Handlers/SolrReindexQueuedHandler.php b/src/Solr/Reindex/Handlers/SolrReindexQueuedHandler.php
index 3289580..e1e9fea 100644
--- a/src/Solr/Reindex/Handlers/SolrReindexQueuedHandler.php
+++ b/src/Solr/Reindex/Handlers/SolrReindexQueuedHandler.php
@@ -11,15 +11,14 @@ use SilverStripe\Core\Injector\Injector;
 use SilverStripe\FullTextSearch\Solr\Reindex\Jobs\SolrReindexQueuedJob;
 use SilverStripe\FullTextSearch\Solr\Reindex\Jobs\SolrReindexGroupQueuedJob;
 use SilverStripe\FullTextSearch\Search\Processors\SearchUpdateCommitJobProcessor;
-
-if (!interface_exists('Symbiote\QueuedJobs\Services\QueuedJob')) {
-    return;
-}
-
 use Symbiote\QueuedJobs\Services\QueuedJob;
 use Symbiote\QueuedJobs\Services\QueuedJobService;
 use Symbiote\QueuedJobs\DataObjects\QueuedJobDescriptor;
 
+if (!interface_exists(QueuedJob::class)) {
+    return;
+}
+
 /**
  * Represents a queued task to start the reindex job
  */
diff --git a/src/Solr/Reindex/Jobs/SolrReindexGroupQueuedJob.php b/src/Solr/Reindex/Jobs/SolrReindexGroupQueuedJob.php
index 92c1730..3566441 100644
--- a/src/Solr/Reindex/Jobs/SolrReindexGroupQueuedJob.php
+++ b/src/Solr/Reindex/Jobs/SolrReindexGroupQueuedJob.php
@@ -2,7 +2,9 @@
 
 namespace SilverStripe\FullTextSearch\Solr\Reindex\Jobs;
 
-if (!interface_exists('Symbiote\QueuedJobs\Services\QueuedJob')) {
+use Symbiote\QueuedJobs\Services\QueuedJob;
+
+if (!interface_exists(QueuedJob::class)) {
     return;
 }
 
diff --git a/src/Solr/Reindex/Jobs/SolrReindexQueuedJob.php b/src/Solr/Reindex/Jobs/SolrReindexQueuedJob.php
index 11128d3..83da226 100644
--- a/src/Solr/Reindex/Jobs/SolrReindexQueuedJob.php
+++ b/src/Solr/Reindex/Jobs/SolrReindexQueuedJob.php
@@ -2,7 +2,9 @@
 
 namespace SilverStripe\FullTextSearch\Solr\Reindex\Jobs;
 
-if (!interface_exists('Symbiote\QueuedJobs\Services\QueuedJob')) {
+use Symbiote\QueuedJobs\Services\QueuedJob;
+
+if (!interface_exists(QueuedJob::class)) {
     return;
 }
 
diff --git a/src/Solr/Reindex/Jobs/SolrReindexQueuedJobBase.php b/src/Solr/Reindex/Jobs/SolrReindexQueuedJobBase.php
index 0e0fc54..074638e 100644
--- a/src/Solr/Reindex/Jobs/SolrReindexQueuedJobBase.php
+++ b/src/Solr/Reindex/Jobs/SolrReindexQueuedJobBase.php
@@ -8,13 +8,12 @@ use SilverStripe\Core\Injector\Injector;
 use SilverStripe\FullTextSearch\Solr\Reindex\Handlers\SolrReindexHandler;
 use SilverStripe\FullTextSearch\Utils\Logging\SearchLogFactory;
 use stdClass;
+use Symbiote\QueuedJobs\Services\QueuedJob;
 
-if (!interface_exists('Symbiote\QueuedJobs\Services\QueuedJob')) {
+if (!interface_exists(QueuedJob::class)) {
     return;
 }
 
-use Symbiote\QueuedJobs\Services\QueuedJob;
-
 /**
  * Base class for jobs which perform re-index
  */
diff --git a/src/Solr/SolrIndex.php b/src/Solr/SolrIndex.php
index 1748363..980080d 100644
--- a/src/Solr/SolrIndex.php
+++ b/src/Solr/SolrIndex.php
@@ -822,7 +822,8 @@ abstract class SolrIndex extends SearchIndex
                 // Extract string suggestion
                 $suggestion = $this->getCollatedSuggestion($res->spellcheck->suggestions->collation);
 
-                // The collation, including advanced query params (e.g. +), suitable for making another query programmatically.
+                // The collation, including advanced query params (e.g. +), suitable for making another query
+                // programmatically.
                 $ret['Suggestion'] = $suggestion;
 
                 // A human friendly version of the suggestion, suitable for 'Did you mean $SuggestionNice?' display.
diff --git a/src/Utils/Logging/MonologFactory.php b/src/Utils/Logging/MonologFactory.php
index b8d3eb3..6b6d779 100644
--- a/src/Utils/Logging/MonologFactory.php
+++ b/src/Utils/Logging/MonologFactory.php
@@ -5,9 +5,11 @@ namespace SilverStripe\FullTextSearch\Utils\Logging;
 use Monolog\Formatter\FormatterInterface;
 use Monolog\Formatter\LineFormatter;
 use Monolog\Handler\HandlerInterface;
+use Monolog\Handler\StreamHandler;
 use Monolog\Logger;
 use SilverStripe\Control\Director;
 use SilverStripe\Core\Injector\Injector;
+use SilverStripe\FullTextSearch\Utils\Logging\QueuedJobLogHandler;
 
 /**
  * Provides logging based on monolog
@@ -53,7 +55,7 @@ class MonologFactory implements SearchLogFactory
         // Unless cli, force output to php://output
         $stream = Director::is_cli() ? $stream : 'php://output';
         $handler = Injector::inst()->createWithArgs(
-            'Monolog\Handler\StreamHandler',
+            StreamHandler::class,
             array($stream, $level, $bubble)
         );
         $handler->setFormatter($formatter);
@@ -73,7 +75,7 @@ class MonologFactory implements SearchLogFactory
             $format = "<p>$format</p>";
         }
         return Injector::inst()->createWithArgs(
-            'Monolog\Formatter\LineFormatter',
+            LineFormatter::class,
             array($format)
         );
     }
@@ -87,7 +89,7 @@ class MonologFactory implements SearchLogFactory
     protected function getLoggerFor($name)
     {
         return Injector::inst()->createWithArgs(
-            'Monolog\Logger',
+            Logger::class,
             array(strtolower($name))
         );
     }
@@ -101,7 +103,7 @@ class MonologFactory implements SearchLogFactory
     protected function getJobHandler($job)
     {
         return Injector::inst()->createWithArgs(
-            'SilverStripe\FullTextSearch\Utils\Logging\QueuedJobLogHandler',
+            QueuedJobLogHandler::class,
             array($job, Logger::INFO)
         );
     }
diff --git a/src/Utils/Logging/QueuedJobLogHandler.php b/src/Utils/Logging/QueuedJobLogHandler.php
index 76eb581..ceb807a 100644
--- a/src/Utils/Logging/QueuedJobLogHandler.php
+++ b/src/Utils/Logging/QueuedJobLogHandler.php
@@ -4,13 +4,12 @@ namespace SilverStripe\FullTextSearch\Utils\Logging;
 
 use Monolog\Handler\AbstractProcessingHandler;
 use Monolog\Logger;
+use Symbiote\QueuedJobs\Services\QueuedJob;
 
-if (!interface_exists('Symbiote\QueuedJobs\Services\QueuedJob')) {
+if (!interface_exists(QueuedJob::class)) {
     return;
 }
 
-use Symbiote\QueuedJobs\Services\QueuedJob;
-
 /**
  * Handler for logging events into QueuedJob message data
  */